Transmission mechanism.



F. M. GOODHUE. TRANSMISSION MECHANISM.

APPLICATION TILED MAR. 25. 1914.

1,132,171 Patented Mar.16,1915.

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fiverzr' F. M. GOODHUE.

TRANSMISSION MECHANISM I APPLICATION FILED MARv 26, 191i. 1,13%,17'}, Patented Mar.16,191:').

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unman sraras rad ans? carton Y FRANK M. GODDHUE, OF VAN NUYS, CALIFORNIA.

TRANSMISSION MECHANISM.

Application filed March 25, 1914. Serial are 327,057.

specification.

My invention relates more particularly to improvements in transmission-mechanism used under the conditions presented. in windmill constructions, my invention having been devised for use more'particularly in connection with Wind-mills.

In wind-mill constructions employing gear-transmission between the shaft carry mg the Wind-wheel, and the reciprocable pump-rod, the pitman which is connected with the crank-gear and with the pump-rod, exerts force against the crank-gear at all times in the same direction, in the operation of'the Wind-mill. Thus in a wind-mill of the type in which the pitman extends upwardly from the cra11k-gcar,'the force ex-' erted eccentrieally on this gear is a down- Ward force at all times. As there always some lost motion between the gears of the transmission, each'time the pitman passes beyond the vertical center line of the crankgear, the force exerted by the pitman causes the teeth of the cranlcgear in mesh with those of the drivin gear, to be driven by the pitman out the engagement with those faces of the driving gear with which it engages in the up or down movement 'of the pitman and into engagement with the opposed faces of the adjacent gears, or in other Words, backlashing which produces very objectionable noise and jar of the mechanism. v

My object is to provide a construction of gear-transmisison whereby objectionable noise from the cause above stated, will be avoided, and the mechanismwill not be subjected to 'jar from this cause.

Referring to the accompanying drawings; Figure l is a broken view in elevation of the upper end of a wind-mill the gear-trans mission of which is con rusted in accord ance with my invention Fig. 2 is an enlarged View in end elevation of the gear mechanism of the structure illustrated in Fig, 1, the cap carried by one-of the shafts being shown in section. Fig. 3 is an enlarged broken view in side eiati-oz; of the crank-gear with a portion of thepitman,

Specification of Letters Patent.

Patented Mar. 16, 1915.

and the driving-gear therefor; and Fig. 4,

an enlarged face view of the intermeshing portions of the drivingwgear and crank-gear.

l have chosen to illustrate my invention as applied to a wind-mill. of the type generally known as the back-geared type, wherein the geartransmission operated by the windwheel shaft, drives the cranlegear at a slower speed than. that of the Wind-wheel shaft, and this type is well known inthe art, a general description only of the machine will suiiice. The central tube'of the wind-mill is represented at 5, this tube in accordance with common practice forming 'the support for the Wind-wheel and vane and the pump'operating parts of the mill actu 'ated by the wind wheeli The vane-supportin frame is shown at 6, this frame being in the form or a yoke rotatably mounted at its arms 7 on the tube 5. The upper end of the tube carries a slotted cross-head guide 8 rotatable thereon and in which re'ciprocates a cross-head9 connected with the reciproeating pump-rod not shown) which operates in the tube 5,

'lhe framework n which the shaft 19 of the wind-wheel (not shown) is journaled, is re in'esented at 11, this frame supporting my improved gear-transmission mechanism, a description of which is as foilows: Fixed on the end of a shaft 12 paralleling the shaft 10', is a crank-gear 13, the eccentrically dis posed pin of which, represented at "l,-iS connected with theiower end of the pump rod-operating pitinan 15, the upper end of this pitman being connected with a pin 1.6 on the cross-head 9, the gear 13 when rotated operating to reciprocate the pump-rod hereinbefore referred to. lhe driveshait 10 carries two gears 17 and 18 of the same size, and meshing with the crankgear 13, the ear 17 being fixed on the shaft 10 and the gear 18 being journaled thereon, each of the gears 17 and 18 being preferably smaller than'tho craiik-gearl a ratio of approximately 1 to 3 being ')referred;

The gear 18, which is in effect a cushion-- h1g2; gear, cooperates with a coiled torsion spring '19 which. encircles a. sleeve 20 rigid. with the gear '18, one end of this spring being connected with the gear 18 and the other end thereof connected with a cupmember 22 which surrounds the spring and is rigidly fastened to a sleeve 21 pinned. to the shaft 10, as indicated at 21*. The spring 19 is arranged. to exert force on the gear 18 tending to rotate iton the shaft 10 in the direction opposite to that in which the gear 17 isdriven by the rotation of the shaft 10. Thus in the case of the construction illustrated the ear 17 is driven in Fig. 3 in a clockwise irection to rotate the crank-gear 13 in the opposite direction, and the spring 19tends to turn the gear 18 .in an anti-clockwise direction on the shaft 10. It will, therefore, be manifest thatthe teeth on the crank-gear 13 as they are moved into meshing engagement with the teeth on the gears 17 and 18, While the pitman is being raised, are engaged at their opposite faces by the teeth on these last referred to gears, the teeth on the gear 17 engaging at their, upper sides with the under-sides of the teeth on the gear 13, and the teeth on the gear 18 engaging at their under-sides with the upper sides of the teeth on the gear 13: as illustrated somewhat exaggeratedly in Fig. 4. The pitman 15 in passing over the center of the shaft 12 tendsto cause the gear '13flto run ahead of the gear 17, but instead of being free to thus run ahead which would JtljllSB the objectionable noise hereinbefore re erred tov when the upper sides of the teeth ant-the gear 13 struck the lower sides of the teeth on the gear 17, owing to lost motion between the gears, is restrained, by the teeth on the gear 18,.as-the teeth on the gear 13 bear at their upper sides against thezlower sidesbf the teeth onthe gear 18, the latter yielding to a degree depending on the torsion of the spring 19, and thusnoise is prevented; it being understood that if desired the torsion" of the spring may be such as to maintain the teeth on the gear 13 in engage with the teeth on the gears 17 and 18 while the pitman is descending. I

- While l'have illustrated and described a 4 particular construction embodying my inv vention, and have shown it as applied to a particular type of wind-mill, I do not Wish;

to be understood as limiting it thereto, as various modifications and'alterations may be made in the construction illustrated, and it may be used in other types of Wind-mills and in other situations, without departing from the scope of the invention.

What I claim as new, and desire to secure" by Letters Patent is:

l. The combination of a gear, means connected therewith and operating in the rotation of said gear to exert on the-latter force tending to rotate it in one direction throughout a part of its revolution, and to resist the with said third gear and operating to yieldingly force said third gear in direction contrary to the direction of rotation of said driving-gear. Y

2. The combination of a gear, means connected therewith and operating in the rotation of said gear to exert on the latter force tending to rotate it in one direction throughout a part of its revolution, and to; resist the movement of said gear during the remainder of its revolution, a driving-gear meshing with said first-named gear,) a third gear meshing with said first-named gear, a sleeve rigid with said third gear, a cap-member fixed on the shaft of said driving-gear, a spring encircling said sleeve and engaging said third gear and said cap-member at its opposite ends 'and operative to yieldingly force said third to the direction-of rotation of saiddrivinggear.

FRANK M. GOODHUE. In presence of-- H. S. TRoT'rER, D. A. BEVIS.

gear in a direction contrary 

